lua get hash value via index code example

Example: lua hash table length

-- there is no way to achieve this other than to create your own function.
-- using #table ("#" is shorthand for table.getn(table)) won't factor in key names.
function table_length(t)
    local z = 0
    for i,v in pairs(t) do z = z + 1 end
    return z
end